Tire yarn method

ABSTRACT

A method for reducing the strength loss and increasing hot elongation tolerance before break of a nylon tire cord which is subjected to an application of coating material during a hot stretching process, by applying to the tire cord a protective finish comprising an alkali metal soap of a fatty acid and an alkanolamine, particularly a lower trialkanolamine.

Frank Holmes Simons Charlotte, N.C. 827,992

May 26,1969

Oct. 5, 1971 Fiber Industries, Inc.

[72] Inventor [21 App]. No. [22] Filed [45] Patented [73] Assignee [54]TIRE YARN METHOD 25 Claims, No Drawings [52] US. Cl 152/359, 57/153,57/164,1l7/138.8 511 1m. (:1 noz 3/48, D02g 3/36 [50] FieldofSearch..57/153, 140 C, 164,157 S; 28/75 R, 76 R; l l7/138.8; 152/359 [56]References Cited UNITED STATES PATENTS 3,475,204 10/1969 Patterson152/359 X 2,349,290 5/ 1944 Loughborough 57/ 1 53 2,663,989 12/1953Schlatter et a1. 57/153 2,691,614 10/1954 Wilson 57/153 2,922,727 1/1960Levison 57/153 2,955,345 10/1960 Howe 228/75 R 3,225,534 12/1965 Knospe57/157 S Primary Examiner-Donald E. Watkins Attorneys-Thomas .1. Morgan,Stephen D. Murphy and Louis Gubinsky ABSTRACT: A method for reducing thestrength loss and increasing hot elongation tolerance before break of anylon tire cord which is subjected to an application of coating materialduring a hot stretching process, by applying to the tire cord aprotective finish comprising an alkali metal soap of a fatty acid and analkanolamine, particularly a lower trialkanolamine.

BACKGROUND The present invention relates to improving the properties ofnylon tire yarn and more particularly to reducing the susceptibility ofnylon tire yarns to strength loss and poor hot stretch tolerance beforebreak on the application of adhesive formulations used to improve theadhesive properties of the yarn to rubber during or prior to defined'hotstretching operations.

Nylon tire yarns, particularlynylon 6,6, which is polyhexamethyleneadipamide; nylon 6, which is polycaprolactam; and the like nylon tirecord materials including mixtures thereof are commonly subjected to anapplication of coating material to improve the adhesive qualities of theyarn to, rubber. A common method of application is to dip the yarn intothe adhesive material, such as a resorcinol-formaldehydelatex or thelike adhesive materials, and to subsequently hot stretch andsimultaneously cure and dry the adhesive on the yarn. The temperatureofthe adhesive material as applied is generally that of the ambienttemperature but the drying temperature during the hot stretchingoperation is sufficiently high so as to detrimentally affect thestrength of the yarn unless it is protected from the heat, steam, pHchanges and the like physical and chemical conditions existing duringsimultaneous drying-hot stretching procedures. While numerous yarnfinishes are known in the art, finishes previously applied to reducestatic electricity, increase yarn handling characteristics, i.e. reducefriction and the like, do not afford sufficient protection to the yarnwhen in the form of a twisted cord from the extreme conditions of anadhesive dip-hot stretch combination, which conditions reduce thephysical properties of the yarn as hereinbefore described, particularlywhen the adhesive material is not dried prior to hot stretching.

it is therefore an object of the present invention to provide a nylontire cord finish which reduces or eliminates strength loss and reducedstretch potential under elevated temperature conditions prior to breakand other physical degradation of nylon tire cords occurring in theapplication of a finish during or prior to a cord hot stretchingoperation. It is another object of the present invention to provide ayarn finish which is easily and readily applied to the tire yarn, whichfinish decreases the yarn sensitivity to pH conditions duringdrying ofadhesive material during a hot stretching operation. These and otherobjects will become apparent to those skilled in the art from thedescription of the invention which follows.

THE INVENTION In accordance with the invention, a method is provided forreducing the strength loss and brittle tendencies of nylon tire cord onbeing subjected to an application of adhesive during a hot stretchingoperation comprising forming a nylon multifilament cord having atenacity of at least 6 grams per denier and a denier per filament ofabout 3 to or higher i.e. 100 or more, applying an aqueous mixture of analkali metal fatty acid soap and an alkanolamine to said cord andsubsequently subjecting said cord to an adhesive application-hotstretching operation. The invention is particularly useful with nylon6,6 wherein the applied alkali metal fatty acid soap is used withtriethanolamine.

The present invention has been found to greatly reduce and eveneliminate strength reduction and poor extensibility previouslyassociated with an adhesive formulation dip-hot stretching operation inthe fonnation of tire cords. While the exact theory of the presentinvention is not fully understood, it is believed that the alkalinenature of the finish composition protects the pH sensitive nylon fromthe degrading influence finishes commonly applied to such tire cords.Further, the finish apparently shields the cords from excessivepenetration of the hot resinous material, thereby preventing excessivedegradation of the nylon due to the deorientation of the fibers at theelevated temperatures and/or other degrading factors associated with thehot stretching process.

DETAILS OF THE INVENTION The present invention utilizes an alkali metalsoap of a fatty acid and an alkanolamine in admixture, preferably in theform of an aqueous solution. The percentage of each of the componentscan very depending upon the mutual solubilities and compatibilities ofthe various ingredients. Additionally, concentrations desired can bevaried in accordance with the amount of finish to be applied, theviscosity of the finish composition, speed of application and the likeconsiderations. As a general rule, it has been found that it isdesirable to maintain the alkanolamine in a relatively highconcentration, proportional to the concentration of soap present, in thefinish composition. The quantity of soap in the finish formulation canvary from being about equal to the amount of amine to less thanone-half, e.g. to about25 percent, of the amine material. The remainderof the composition is desirably water. Of course, organic solvents canbe used in place of water for nonaqueous finish formulations.

Typically, the finish composition, by weight, comprises about 30 topercent amine, 5 to 70 percent alkali metal fatty acid soap, and 0 to-65percent water, the proportions being adjusted to a total of percent.More preferably, the finish solution comprises 40 to 50 percent amine,18 to 28 percent alkali metal soap'of a fatty acid, and 28 to 38 percentwater. A particularly preferred composition comprises 45 percenttriethanolamine, 22 percent of the sodium soap of coconut oil and 33percent water.

Any of a number of dispersion mediums may be employed in the applicationof the finish formulation. Most often, the alkanolamine is a liquid atthe temperature of application with which a liquid or solid soap may beadmixed in the disclosed concentrations with or without the addition ofwater as described in the preferred embodiments of the invention. Wherenecessary or desired, of course, other inert solvent dispersion mediumssuch as lower alcohols such as methanol, ethanol and mixtures thereof,as well as suspension and/or emulsion formulations may be employed withequally good results.

The finish formulation should be applied so as to give at least about a0.5 percent by weight pickup, based on weight of uncoated yarn.Preferably, l to 10 percent pickup, and most preferably about I to 2percent finish pickup is employed. The temperature of'the finishformulation of the invention during yarn application may vary widely.Where aqueous formulations are employed, temperature most often will bein the range of about 5 to 95 C., preferably below 40 C., and mostpreferably about ambient temperature, e.g. 20-25 C.

The amine used in-the present invention is preferably a loweralkanolamine and, more preferably, a lower trialkanolamine. The termlower is used herein to describe a carbon chain of one to six carbonatoms, inclusive. Thus, mono-, di-, and tri-alkanolamines arecontemplated amines wherein each of the alkanol segments contains one tosix carbon atoms. Typical amines include monomethanolamine,

dimethanolamine, trimethanolamine, monoethanolamine, diethanolamine,triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine,monobutanolamine,

dibutanolamine, tributanolamine, mixtures of the same and the likeamines. Of course, diand trisubstituted amines wherein the alkanolgroups are dissimilar, i.e. methanoldiethanolamine,.can also be used.

The fatty acid soaps utilized in the present invention are alkali metalsoapsof fatty acid groups of 12 to 22 or more carbon atoms. The fattyacid groups can be obtained from any of the numerous sources ofsaponifiable fatty chains such as animal and vegetableoils, petroleumstocks and the like. Of particular interest are the glyceride esters offatty acids which are readily hydrolyzed, using an alkali metalhydroxide. to the corresponding alkali metal soap of a fatty acid. Insuch instance, it has been found to be particularly desirable to utilizethe esterification product as such, without removal of the formedglyceride.

In addition to having residual glycerides in the saponification product,vegetable and the like oils are normally a mixture of several differentfatty acids of varying chain length and degree of unsaturation. Inparticular, the saturated or nondrying oils are recommended for use inthe present invention, although drying and semidrying oils can also beused either as such or following hydrogenation. Typical animal,vegetable and marine oils of the type useful herein include soya, tung,linseed, coconut, menhaden, anchovy, tuna, oiticica, safflower. rapeseed and the like. Thus, typical hydrogenated or saturated fatty acidsinclude stearic, lauric, palmitic, vehenic, myristic, arachardic,tridecanoic, pentadecanoic, heptadecanoic, nonadecanoic and the like.The preferred coconut oil generally contains caprylic, copric, lauric,myristic, palmitic, steric, oleic, linoleic and linolenic acids. Thealkali metal used for the formation of the soap may be any of the group1(a) alkali metal periodic chart elements and preferably is selectedfrom lithium, sodium and potassium. Sodium and potassium are mostpreferred, particularly because of their availability, low cost andeffectiveness. The alkali metal is mostly commonly utilized in the formof the corresponding hydroxide in the saponification of the fatty acid,or ester or other saponifiable derivative thereof.

The nylon yarn utilized in the present invention is normally consideredto be a high-tenacity multifilament yarn. Thus, the yarn has a tenacityof at least 6 grams per denier and may have a tenacity as high as 10grams per denier or more. Normally, the higher the tenacity, the bettersuited such material is for tire cord. The denier of individualfilaments in such hightenacity yarns is normally higher than that oftextile grade nylon filaments, and preferably is in the range of aboutthree to 15. Higher deniers could be used provided the desired yarnflexibility is retained. The number of filaments per cord can verygreatly. However, it is preferred to have a large number of filamentssuch as more than 10, and more preferably more than 100 filaments percord. A typical tire yarn commonly has about l40 filaments per cord.

The form of the coating material applied to the tire cord containing thefinish described herein will vary depending upon the particular tiremanufacturing operation involved. The present invention has particularutility in combination with adhesive application to the tire cord. Theadhesive coating material is usually employed to enhance theadhesiveness of the cord to rubber, and thus, numerous materials areutilized. Such compositions can be aqueous solutions or emulsions aswell as solvent solutions and/or suspensions. Similarly the particulartype of adhesive used, the manufacturers preference to employment withhis particular integrated system and the like determine the particularcondition in turing processes involving the application of cold adhesiveformulation to a plied or otherwise twisted cord, or fabric constructedtherefrom, which is subsequently hot stretched before the adhesive hasdried. Although the invention is exemplified with respect to this kindof process, it should be understood that yarn which may demonstratesimilar undesired properties because of different reasons may also beprotected and benefited by the present invention.

While the invention has been described more particularly with referenceto tire cord, it is therefore to be recognized that the presentinvention is generally related to industrial yarns to which coating,particularly adhesive materials. are subsequently applied during hotstretching operations in a plied or twisted cord configuration. Thus,while the tire yarn is the biggest end use of such industrial yarns,conveyor belts, vbelts. drive belts, and the like. wherein resinousmaterials are applied to increase the adhesion to rubber or othermaterials are likewise within the scope of the present invention.

The invention will be more fully described by reference to the presentexamples. The following are examples which illustrate certain preferredembodiments of the present invention. Unless otherwise indicated, alltemperatures are in degrees centigrade and all parts are by weightEXAMPLE I An industrial nylon cord is formed by twisting a 840/140 nylon6,6 multifilament yarn having a tenacity of 9.0 grams per denier and anelongation at the break of 15.5 percent, 12 turns in the 8" direction inthe singles and then plying two such yarns by twisting them 12 turns inthe 2'' direction. The cord has an average breaking strength of about31.8 pounds and average elongation at the break of about 21.8 percent.All yarns contain a normal spin finish. The cord is then additionallytopcoated as stated in table I utilizing an applicator roll procedureand, following drying of the coating material. is dipped in a standardresorcinol-formaldehyde-latex adhesive at room temperature andimmediately passed before the adhestretched 12 percent. This stretchingoperation 18 referred to as single pass processing." The term"topcoating" and the like refers to the additional soap-alkanolaminefinish formulation which is applied to the yarn in addition to thenormal spin finish.

in a like manner, industrial nylon cord may be hot stretched at atemperature within the range of about 300 F. up to the degradationand/or melting point of the polymer. preferably in the range of about300 to 500 C following application of the finish formulation of theinvention.

t (ireige cord Processed curd Breaking Tenacity Elongation BreakingElongation Breaking Pick-up strength (grams per at break strength atbreak strength Strength on yarn Top coat Denier (pound) denier)(percent) (P und) (Percent) (pound retention (percent) I 1867 31.5 7.0521.4 30.9 |4.| so 08 Lubncatmg otl 1899 32.2 7.69 23.9 23.8 11.0 23.8 741.5 3 lvory soap... 1862 31.4 7.67 23.2 31.7 16.1 31 7 101 1.5 4...Coconut soap.. 1898 32.4 7.74 20.7 32.6 15.6 32.0 101 1.5 5.. Coconutsoap..... 1848 31.0 7 61 21.8 31.2 15.6 31.2 101 1.5

which the adhesive material is applied to the cord. Also. the 65 Thisexample illusuates enhanced length retention method of application canbe varied. Application such as by brushing, spraying and the like can beused, with a dip application being normally preferred because of thespeed and thoroughness of application thereby achieved.

As stated hereinbefore, the present invention, through the applicationof the soap-alkanolamine mixture to nylon yarn, prevents strength lossand the tendency to form comparatively brittle yarn segments resultingin a low tolerance to hot stretch as occurs during certain manufacturingoperations. These adamounting to an actual slight increase in cordstrength, resulting from the inclusion of a soap as disclosed herein ina topcoating formulation. It is also interesting to note that thecontrol cord (Sample 1) loses relatively little strength under thesingle pass processing utilized in example I The viscosity of thetopcoating formulation can very widely as long as ease of application ismaintained with respect to the particular application technique andtemperature employed. Thus, viscosity could correspond to that ofmineral spirits up verse effects are particularly pronounced during themanufacto that of heavy motor oil where desired. Preferably, viscositysive dries through a 420 F. oven for 20 seconds while being is regulatedto be about that of water at the preferred temperature of application,which is room temperature, eg about 22 C., while a room temperatureviscosity within the range of about -20 centipoises is highly preferredfor high-speed yarn finishing. Although a number of exemplary oils havebeen stated hereinbefore for use with the invention, an oil having arelatively high saponification number is preferred since it will exhibitexcellent miscibility and/or solubility with hydrophilic finishformulation components, i.e. water and trialkanolamine, at roomtemperature. As the saponification number of the oil decreases, there isa proportional decrease in water solubility since the oil would becharacterized by a lower number of available acid radicals per unitweight, saponification number being a measure of total free and combinedacids, e.g. esters, expressed as number of milligrams of potassiumhydroxide required for complete saponification of one gram of substance.To avoid the use of elevated temperatures during application and/orsuspension agents, the oil employed, which can be a mixture of two ormore oils as well as one or more pure acids, should have asaponification number over 200, and preferably over 250. Thesaponification number of coconut oil is within the range of about254-262. Palm oil, depending upon geographical and extractive origin,can have a saponification number as low as 200 and as high as 255. As 2examples of oils having values slightly below the preferred values,there may be mentioned cottonseed oil and corn oil with saponificationnumbers within the ranges of 194-196 and 187-193, respectively. Ofcourse, cottonseed, corn and similar oils are still usable with theinvention but as saponification number decreases further, elevatedtemperatures are required.

The date in table II demonstrates the contribution of the alkanolamineto increase the cords extensibility at elevated temperatures encounteredduring industrial processing, particularly during tire yarnmanufacturing operations, and pin- 5 points preferred and optimumtopcoat formulation ranges. It

is interesting to note the relatively minor contribution required of thesoap under the stretching conditions employed in example 11 (Compare toSample 1 of example I). The use of a lubricating oil in place of thesoap-triethanolamine finish yields about a 14 percent stretch-breakunder the conditions of example 11.

Although the triethanolamine where used alone under the particularprocessing conditions of example 11 does not result in a materialreduction in yarn breaking strength, the topcoated yam will abrade to anunacceptable degree where subjected to normal friction encounteredduring many high-friction yarn processes, Such as high-speed twisting ofthe order of 6,000 rotations per minute onto a spindle through a balloonguide. Of course, in a sense, abrasion of the yarn surface also producesa final product of reduced tenacity. The alkali metal fatty acid soap isan acceptable yarn lubricant under normal high-speed yarn processingconditions and is therefore, included in the finish formulation of theinvention for its lubricating properties in addition to its function asa yarn strength retention agent.

EXAMPLE III The nylon industrial cord of example I is processed inaccordance with example I with the topcoating finish formulations asdescribed in table 111 being applied prior to the adhesiveapplication-hot stretch single pass process.

TABLE III Sample Topeont 33% coconut 18% ivory 18% Ivory 33% ivory 23%coconut potassium soap; soap; soup; sodium soup: soup; 82% TEA 82% TEA67% TEA 77% TEA 07;: TBA

Topcoat concentration in water, percen 1 100 43 1 100 50 Applicationtemperature, C. 40 1 22 Y 22 -10 2'. Gl'eige cord:

Denler 1,913 1,872 1,864 1,.128 1,85!) Breaking strength, 11).. 31. 531. 7 32. 2 30. l 111.!) Tenacity, g.p.d 7.47 7. 7.83 7.03 7.7!!Elongation at the break, percent 21.0 22. 22.0 21. 2 21. 5 Processedcord:

Stretch-break, percent 24 20 20 22 20 Breaking strength, lb. 30. 7 32. 032. 8 30. 4 32. 2 Elongation at the break, percenL. 15.1) 15.0 13.8 13.5 l3. 1 Strength retention, percent 97 103 10.! I01 I01 TEATrlethanolamine.

Ivory soap=A commercial bar soap 01 mixed oleatvs, strearatos, andcoconut oil.

I No water. Ambient.

EXAMPLE II The nylon industrial cord of example I is topcoated with afinish formulation containing varying amounts of coconut soap andtriethanolamine as detailed in table II and is then subjected to thesingle pass processing described in example I.

With reference to the above examples, the Ivory soap employed is thecommercially available material available from Proctor and Gamble ofCincinnatti, Ohio.

Various modifications within the scope of the invention will appearobvious to those skilled in the art. For example, where desired only oneof the finish formulation components may be Strett h-Break-Percent' asused In table 11 is a measurement of the cords tolerance to a hotstretch before breaking employed since it s apparent that the soap isprimarily involved with strength retention while the alkanolamine conatthe temperature employed during cord processing (420 F. tributes chieflyto hot stretch tolerance in example 11) What is claimed is.

1. A nylon multifilament yarn having a tenacity of at least 6 grams perdenier, a denier per filament of about 3 to 15 and having substantiallyuniformly distributed thereon in an amount of at least 0.5 percent byweight of the yarn a topcoating consisting essentially of an alkalimetal fatty acid soap wherein said soap is selected from thesaponification products of fatty acid materials having fatty groupswithin the range of about 12 to 22 carbon atoms and the alkali metal isan element of group 1(a) of the periodic chart and a lower alkanolamine,said yarn being characterized by lack of strength loss and goodtolerance to hot stretching during a coating-hot stretching operation.

2. The yarn of claim 1 in the form of a tire cord.

3. An article of manufacture comprising the yarn of claim 1 as areinforcement material.

4. A tire reinforced with the cord of claim 2.

5. A process for preventing strength loss and reduced tolerance to hotstretching of nylon industrial monofilament or multifilament yarn duringyarn processing which process comprises applying a finish formulation ofa mixture of an alkali metal fatty acid soap wherein said soap isselected from the saponification products of fatty acid materials havingfatty groups within the range of about 12 to 22 carbon atoms and thealkali metal is an element of group 1(a) of the periodic chart and alower alkanolamine to said yarn to give a pickup of at least about 0.5percent by weight of finish on the yarn prior to said yarn processing.

6. The process of claim 5 wherein said nylon is nylon 6,6.

7. The process of claim 5 wherein said soap is the saponificationproduct of coconut oil.

8. The process of claim 5 wherein the saponification product is usedwithout the separation of the glycerols formed during saidsaponification.

9. The process of claim 5 wherein said amine is a tri-alkanolamine.

10. The process of claim 9 wherein said amine is triethanolamine.

11. The process of claim 5 wherein said soap and said alkanolamine arein the ratio of soap/amine in the finish formulation of about 1 l to l/4 by weight.

12. The process of claim 5 wherein said finish formulation, per l parts,contains 30-95 parts of said amine, -70 parts of said soap and 0-65parts water, by weight.

13. The process of claim 9 wherein said finish formulation, per 100parts, contains 40-50 parts of said amine, 18-28 parts of said soap and28-38 parts H O, by weight.

14. The process of claim wherein said finish formulation, per 100 parts,by weight contains about 45 parts of said amine, about 22 parts of saidsoap, said soap being coconut soap, and about 33 parts water.

A process for producing a nylon tire cord which comprises preparing anylon multifilament yarn having a tenacity of at least about 6 grams perdenier and a denier per filament of about 3 to 15; topcoating said yamwith a lower alkanolamine to give a pickup of at least about 0.5 percentby weight of said amine on said yarn; forming a twisted cord from saidyarn; applying a resorcinol-formaldehyde-latex adhesive to said cord andhot stretching said cord before said adhesive dries to simultaneouslycure and dry said adhesive on said yarn during said hot stretching.

16. The process of claim 15 wherein said alkanolamine istriethanolamine.

17. A process for coating and hot stretching nylon industrialmonofilament or multifilament yarn while reducing strength loss andincreasing tolerance to hot stretching of said yarn during saidcoating-hot stretching operation which comprises fonning a nylon yarnhaving a tenacity of at least 6 grams per denier and a denier perfilament of at least about 3 to 15; applying a finish formulation of amixture of an alkali metal fatty acid soap wherein said soap is selectedfrom the saponification products of fatty acid materials having fattygroups within the range of about l2 to 22 carbon atoms and the alkalimetal is an element of group 1(a) of the periodic chart and loweralkanolamine to said yarn to give a pickup of at least 0.5 ercent byweight of finish on the yarn and subsequently su ecting said yarn to acoating-hot stretching operation.

18. The process of claim 17 wherein said yarn is a multifilament yarntwisted and subjected to a coating-hot stretching operation to form atire cord.

19. The process of claim 18 wherein said coating-hot stretchingoperation comprises the application of an adhesive formulation to saidcord and hot stretching of said cord before said adhesive formulationdries.

20. The process of claim 19 wherein said soap is the saponificationproduct of coconut oil and said amine is triethanolamine.

21. The process of claim 19 wherein said soap and said alkanolamine arein the ratio of soap/amine in the finish formulation of about U l to H4by weight.

22. The process of claim 19 wherein said finish formulation, per parts,contains 30-95 parts of said amine. 5-70 parts of said soap and O-65parts water, by weight.

23. The process of claim 19 wherein said finish formulation, per 100parts, contains 40-50 pans of said amine, l8-28 parts of said soap and28-38 parts H O, by weight 24. The process of claim 19 wherein saidfinish formulation. per 100 parts, by weight contains about 45 parts ofsaid amine. about 22 parts of said soap, said soap being coconut soap,and about 33 parts water.

25. The process of claim 24 wherein said coating is aresorcinol-formaldehyde-latex adhesivev

2. The yarn of claim 1 in the form of a tire cord.
 3. An article ofmanufacture comprising the yarn of claim 1 as a reinforcement material.4. A tire reinforced with the cord of claim
 2. 5. A process forpreventing strength loss and reduced tolerance to hot stretching ofnylon industrial monofilament or multifilament yarn during yarnprocessing which process comprises applying a finish formulation of amixture of an alkali metal fatty acid soap wherein said soap is selectedfrom the saponification products of fatty acid materials having fattygroups within the range of about 12 to 22 carbon atoms and the alkalimetal is an element of group 1(a) of the periodic chart and a loweralkanolamine to said yarn to give a pickup of at least about 0.5 percentby weight of finish on the yarn prior to said yarn processing.
 6. Theprocess of claim 5 wherein said nylon is nylon 6,6.
 7. The process ofclaim 5 wherein said soap is the saponification product of coconut oil.8. The process of claim 5 wherein the saponification product is usedwithout the separation of the glycerols formed during saidsaponification.
 9. The process of claim 5 wherein said amine is atri-alkanolamine.
 10. The process of claim 9 wherein said amine istriethanolamine.
 11. The process of claim 5 wherein said soap and saidalkanolamine are in the ratio of soap/amine in the finish formulation ofabout 1/1 to 1/4 by weight.
 12. The process of claim 5 wherein saidfinish formulation, per 100 parts, contains 30-95 parts of said amine,5-70 parts of said soap and 0-65 parts water, by weight.
 13. The processof claim 9 wherein said finish formulation, per 100 parts, contains40-50 parts of said amine, 18-28 parts of said soap and 28-38 parts H2O,by weight.
 14. The process of claim 10 wherein said finish formulation,per 100 parts, by weight contains about 45 parts of said amine, about 22parts of said soap, said soap being coconut soap, and about 33 partswater.
 15. A process for producing a nylon tire cord which comprisespreparing a nylon multifilament yarn having a tenacity of at least about6 grams per denier and a denier per filament of about 3 to 15;topcoating said yarn with a lower alkanolamine to give a pickup of atleast about 0.5 percent by weight of said amine on said yarn; forming atwisted cord from said yarn; applying a resorcinol-formaldehyde-latexadhesive to said cord and hot stretching said cord before said adhesivedries to simultaneously cure and dry said adhesive on said yarn duringsaid hot stretching.
 16. The process of claim 15 wherein saidalkanolamine is triethanolamine.
 17. A process for coating and hotstretching nylon industrial monofilament or multifilament yarn whilereducing strength loss and increasing tolerance to hot stretching ofsaid yarn during said coating-hot stretching operation which comprisesforming a nylon yarn having a tenacity of at least 6 grams per denierand a denier per filament of at least about 3 to 15; applying a finishformulation of a mixture of an alkali metal fatty acid soap wherein saidsoap is selected from the saponification products of fatty acidmaterials having fatty groups within the range of about 12 to 22 carbonatoms and the alkali metal is an element of group 1(a) of the periodicchart and lower alkanolamine to said yarn to give a pickup of at least0.5 percent by weight of finish on the yarn and subsequently subjectingsaid yarn to a coating-hot stretching operation.
 18. The process ofclaim 17 wherein said yarn is a multifilament yarn twisted and subjectedto a coating-hot stretching operation to form a tire cord.
 19. Theprocess of claim 18 wherein said coating-hot stretching operationcomprises the application of an adhesive formulation to said cord andhot stretching of said cord before said adhesive formulation dries. 20.The process of claim 19 wherein said soap is the saponification productof coconut oil and said amine is triethanolamine.
 21. The process ofclaim 19 wherein said soap and said alkanolamine are in the ratio ofsoap/amine in the finish formulation of about 1/1 to 1/4 by weight. 22.The process of claim 19 wherein said finish formulation, per 100 parts,contains 30-95 parts of said amine, 5-70 parts of said soap and 0-65parts water, by weight.
 23. The process of claim 19 wherein said finishformulation, per 100 parts, contains 40-50 parts of said amine, 18-28parts of said soap and 28-38 parts H2O, by weight.
 24. The process ofclaim 19 wherein said finish formulation, per 100 parts, by weightcontains about 45 parts of said amine, about 22 parts of said soap, saidsoap being coconut soap, and about 33 parts water.
 25. The process ofclaim 24 wherein said coating is a resorcinol-formaldehyde-latexadhesive.